| Commit message (Collapse) | Author | Age | Files | Lines |
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
Pull percpu updates from Tejun Heo:
- Nick improved generic implementations of percpu operations which
modify the variable and return so that they calculate the physical
address only once.
- percpu_ref percpu <-> atomic mode switching improvements. The
patchset was originally posted about a year ago but fell through the
crack.
- misc non-critical fixes.
* 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
mm/percpu.c: fix potential memory leakage for pcpu_embed_first_chunk()
mm/percpu.c: correct max_distance calculation for pcpu_embed_first_chunk()
percpu: eliminate two sparse warnings
percpu: improve generic percpu modify-return implementation
percpu-refcount: init ->confirm_switch member properly
percpu_ref: allow operation mode switching operations to be called concurrently
percpu_ref: restructure operation mode switching
percpu_ref: unify staggered atomic switching wait behavior
percpu_ref: reorganize __percpu_ref_switch_to_atomic() and relocate percpu_ref_switch_to_atomic()
percpu_ref: remove unnecessary RCU grace period for staggered atomic switching confirmation
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in order to ensure the percpu group areas within a chunk aren't
distributed too sparsely, pcpu_embed_first_chunk() goes to error handling
path when a chunk spans over 3/4 VMALLOC area, however, during the error
handling, it forget to free the memory allocated for all percpu groups by
going to label @out_free other than @out_free_areas.
it will cause memory leakage issue if the rare scene really happens, in
order to fix the issue, we check chunk spanned area immediately after
completing memory allocation for all percpu groups, we go to label
@out_free_areas to free the memory then return if the checking is failed.
in order to verify the approach, we dump all memory allocated then
enforce the jump then dump all memory freed, the result is okay after
checking whether we free all memory we allocate in this function.
BTW, The approach is chosen after thinking over the below scenes
- we don't go to label @out_free directly to fix this issue since we
maybe free several allocated memory blocks twice
- the aim of jumping after pcpu_setup_first_chunk() is bypassing free
usable memory other than handling error, moreover, the function does
not return error code in any case, it either panics due to BUG_ON()
or return 0.
Signed-off-by: zijun_hu <zijun_hu@htc.com>
Tested-by: zijun_hu <zijun_hu@htc.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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pcpu_embed_first_chunk() calculates the range a percpu chunk spans into
@max_distance and uses it to ensure that a chunk is not too big compared
to the total vmalloc area. However, during calculation, it used incorrect
top address by adding a unit size to the highest group's base address.
This can make the calculated max_distance slightly smaller than the actual
distance although given the scale of values involved the error is very
unlikely to have an actual impact.
Fix this issue by adding the group's size instead of a unit size.
BTW, The type of variable max_distance is changed from size_t to unsigned
long too based on below consideration:
- type unsigned long usually have same width with IP core registers and
can be applied at here very well
- make @max_distance type consistent with the operand calculated against
it such as @ai->groups[i].base_offset and macro VMALLOC_TOTAL
- type unsigned long is more universal then size_t, size_t is type defined
to unsigned int or unsigned long among various ARCHs usually
Signed-off-by: zijun_hu <zijun_hu@htc.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Fix two cases where a __percpu pointer cast drops __percpu.
Signed-off-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Some architectures require an additional load to find the address of
percpu pointers. In some implemenatations, the C aliasing rules do not
allow the result of that load to be kept over the store that modifies
the percpu variable, which causes additional loads.
Work around this by finding the pointer first, then operating on that.
It's also possible to mark things as restrict and those kind of games,
but that can require larger and arch specific changes.
On powerpc, __this_cpu_inc_return compiles to:
ld 10,48(13)
ldx 9,3,10
addi 9,9,1
stdx 9,3,10
ld 9,48(13)
ldx 3,9,3
With this patch it compiles to:
ld 10,48(13)
ldx 9,3,10
addi 9,9,1
stdx 9,3,10
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
To: Tejun Heo <tj@kernel.org>
To: Christoph Lameter <cl@linux.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
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This patch targets two things which are related to ->confirm_switch:
1. Init ->confirm_switch pointer with NULL on percpu_ref_init() or
kernel frightfully complains with WARN_ON_ONCE(ref->confirm_switch)
at __percpu_ref_switch_to_atomic if memory chunk was not properly
zeroed.
2. Warn if RCU callback is still in progress on percpu_ref_exit().
The race still exists, because percpu_ref_call_confirm_rcu()
drops ->confirm_switch to NULL early, but that is only a warning
and still the caller is responsible that ref is no longer in
active use. Hopefully that can help to catch incorrect usage
of percpu-refcount.
Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
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percpu_ref initially didn't have explicit mode switching operations.
It started out in percpu mode and switched to atomic mode on kill and
then released. Ensuring that kill operation is initiated only after
init completes was naturally the caller's responsibility.
percpu_ref_reinit() was introduced later but it didn't shift the
synchronization responsibility. Reinit can't be performed until kill
is confirmed, so there was nothing to worry about
synchronization-wise. Also, as both reinit and kill manipulate the
base reference, invocations of the same function couldn't be allowed
to race each other.
The latest additions of percpu_ref_switch_to_atomic/percpu() changed
the situation. These two functions can be called any time as long as
the percpu_ref is between init and exit and thus there are valid valid
usage scenarios where these new functions race with each other or
against reinit/kill. Mostly from inertia, f47ad4578461 ("percpu_ref:
decouple switching to percpu mode and reinit") still left
synchronization among percpu mode switching operations to its users.
That the new switch functions can be freely mixed with kill/reinit but
the operations themselves should be synchronized is too subtle a
requirement and led to a very subtle race condition in blk-mq freezing
path.
This patch fixes the situation by introducing percpu_ref_switch_lock
to protect mode switching operations. This ensures that percpu-ref
users don't have to worry about mode changing operations racing
against each other, e.g. switch_to_percpu against kill, as long as the
sequence of operations is valid.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Akinobu Mita <akinobu.mita@gmail.com>
Link: http://lkml.kernel.org/g/1443287365-4244-7-git-send-email-akinobu.mita@gmail.com
Fixes: f47ad4578461 ("percpu_ref: decouple switching to percpu mode and reinit")
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Restructure atomic/percpu mode switching.
* The users of __percpu_ref_switch_to_atomic/percpu() now call a new
function __percpu_ref_switch_mode() which calls either of the
original switching functions depending on the current state of
ref->force_atomic and the __PERCPU_REF_DEAD flag. The callers no
longer check whether switching is necessary but always invoke
__percpu_ref_switch_mode().
* !ref->confirm_switch waiting is collected into
__percpu_ref_switch_mode().
This patch doesn't cause any behavior differences.
Signed-off-by: Tejun Heo <tj@kernel.org>
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When an atomic or percpu switching starts before the previous atomic
switching finishes, the taken behaviors are
* If the new atomic switching has confirmation callback, it waits
for the previous atomic switching to complete.
* If the new percpu switching is the first percpu switching following
the previous atomic switching, it waits the previous atomic
switching to complete.
No percpu_ref user depends on these subtleties. The only meaningful
part is that, if the caller ensures that atomic switching isn't in
progress, mode switching operations can be issued from any context.
This patch pulls the wait logic to the top of both switching functions
so that they always wait for the previous atomic switching to
complete. This makes the behavior simpler and consistent for both
directions and will help allowing concurrent invocations of mode
switching functions.
Signed-off-by: Tejun Heo <tj@kernel.org>
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percpu_ref_switch_to_atomic()
Reorganize __percpu_ref_switch_to_atomic() so that it looks
structurally similar to __percpu_ref_switch_to_percpu() and relocate
percpu_ref_switch_to_atomic so that the two internal functions are
co-located.
This patch doesn't introduce any functional differences.
Signed-off-by: Tejun Heo <tj@kernel.org>
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switching confirmation
At the beginning, percpu_ref guaranteed a RCU grace period between a
call to percpu_ref_kill_and_confirm() and the invocation of the
confirmation callback. This guarantee exposed internal implementation
details and got rescinded while switching over to sched RCU; however,
__percpu_ref_switch_to_atomic() still inserts a full sched RCU grace
period even when it can simply wait for the previous attempt.
Remove the unnecessary grace period and perform the confirmation
synchronously for staggered atomic switching attempts. Update
comments accordingly.
Signed-off-by: Tejun Heo <tj@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
Pull libata updates from Tejun Heo:
- Write same support added
- Minor ahci MSIX irq handling updates
- Non-critical SCSI command translation fixes
- Controller specific changes
* 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
ahci: qoriq: Revert "ahci: qoriq: Disable NCQ on ls2080a SoC"
libata: remove <asm-generic/libata-portmap.h>
libata: remove unused definitions from <asm/libata-portmap.h>
pata_at91: Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
ata: Replace BUG() with BUG_ON().
ata: sata_mv: Replacing dma_pool_alloc and memset with a single call dma_pool_zalloc.
libata: Some drives failing on SCT Write Same
ahci: use pci_alloc_irq_vectors
libata: SCT Write Same handle ATA_DFLAG_PIO
libata: SCT Write Same / DSM Trim
libata: Add support for SCT Write Same
libata: Safely overwrite attached page in WRITE SAME xlat
ahci: also use a per-port lock for the multi-MSIX case
ARM: dts: STiH407-family: Add ports-implemented property in sata nodes
ahci: st: Add ports-implemented property in support
ahci: qoriq: enable snoopable sata read and write
ahci: qoriq: adjust sata parameter
libata-scsi: fix MODE SELECT translation for Control mode page
libata-scsi: use u8 array to store mode page copy
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This reverts commit 640847298e2b7f19 ("ahci: qoriq: Disable NCQ
on ls2080a SoC")
The erratum has been fixed in ls2080a v2.0 and later soc.
In reality, customer will not get any ls2080a v1.0 soc. Neither apply
to any products. So reverting this commit won't create any side effect.
Blacklisting v2.0 could also be a option, but that needs to check the
soc version which is not suitable in the driver.
Signed-off-by: Tang Yuantian <yuantian.tang@nxp.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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asm-generic is only intended for architecture defaults, and we can simply
kill it off by moving the two defintions directly to <linux/libata.h>.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Signed-off-by: Harman Kalra <harman4linux@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Replace BUG() with BUG_ON().
Caught by coccinelle.
Signed-off-by: Harman Kalra <harman4linux@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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dma_pool_zalloc.
Replacing dma_pool_alloc and memset with a single call to dma_pool_zalloc
Signed-off-by: Harman Kalra <harman4linux@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Restrict support SCT Write Same to devices which also support ZAC where
support is required.
Reported-by: Mike Krinkin <krinkin.m.u@gmail.com>
Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Use the new pci_alloc_irq_vectors API to allocate MSI-X and MSI vectors.
The big advantage over the old code is that we can use the same API for
MSI and MSI-X, and that we don't need to store the MSI-X vector mapping
in driver-private data structures.
This first conversion keeps the probe order as-is: MSI-X multi vector,
MSI multi vector, MSI single vector, MSI-X single vector and last a
single least legacy interrupt line. There is one small change of
behavior: we now check the "MSI Revert to Single Message" flag for
MSI-X in addition to MSI.
Because the API to find the Linux IRQ number for a MSI/MSI-X vector
is PCI specific, but libahaci is bus-agnostic I had to a
get_irq_vector function pointer to struct ahci_host_priv. The
alternative would be to move the multi-vector case of ahci_host_activate
to ahci.c and just call ata_host_activate directly from the others
users of ahci_host_activate.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Use non DMA write log when ATA_DFLAG_PIO is set.
Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
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Correct handling of devices with sector_size other that 512 bytes.
In the case of a 4Kn device sector_size it is possible to describe a much
larger DSM Trim than the current fixed default of 512 bytes.
This patch assumes the minimum descriptor is sector_size and fills out
the descriptor accordingly.
The ACS-2 specification is quite clear that the DSM command payload is
sized as number of 512 byte transfers so a 4Kn device will operate
correctly without this patch.
Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Acked-by: Tejun Heo <tj@kernel.org>
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SATA drives may support write same via SCT. This is useful
for setting the drive contents to a specific pattern (0's).
Translate a SCSI WRITE SAME 16 command to be either a DSM TRIM
command or an SCT Write Same command.
Based on the UNMAP flag:
- When set translate to DSM TRIM
- When not set translate to SCT Write Same
Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
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Safely overwriting the attached page to ATA format from the SCSI formatted
variant.
Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
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Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Despite ST AHCI version = 1.3, reading HOST_PORTS_IMPL
returns 0. So force HOST_PORTS_IMPL to 1 by using
ports-implemented DT property.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Despite ST AHCI version = 1.3, reading HOST_PORTS_IMPL
returns 0. So force_port_map to 1 by using ports-implemented
DT property.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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By default the SATA IP on the qoriq SoCs does not generating
coherent/snoopable transactions. This patch enable it in the
sata axicc register.
In addition, the dma-coherent property must be set on the
SATA controller nodes.
Signed-off-by: Tang Yuantian <yuantian.tang@nxp.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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The default values for Port Phy2Cfg register and
Port Phy3Cfg register are better, no need to overwrite them.
Signed-off-by: Tang Yuantian <yuantian.tang@nxp.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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scsi_done() was called repeatedly and apparently because of that,
the kernel would call trace when we touch the Control mode page:
Call Trace:
[<ffffffff812ea0d2>] dump_stack+0x63/0x81
[<ffffffff81079cfb>] __warn+0xcb/0xf0
[<ffffffff81079e2d>] warn_slowpath_null+0x1d/0x20
[<ffffffffa00f51b0>] ata_eh_finish+0xe0/0xf0 [libata]
[<ffffffffa00fb830>] sata_pmp_error_handler+0x640/0xa50 [libata]
[<ffffffffa00470ed>] ahci_error_handler+0x1d/0x70 [libahci]
[<ffffffffa00f55f0>] ata_scsi_port_error_handler+0x430/0x770 [libata]
[<ffffffffa00eff8d>] ? ata_scsi_cmd_error_handler+0xdd/0x160 [libata]
[<ffffffffa00f59d7>] ata_scsi_error+0xa7/0xf0 [libata]
[<ffffffffa00913ba>] scsi_error_handler+0xaa/0x560 [scsi_mod]
[<ffffffffa0091310>] ? scsi_eh_get_sense+0x180/0x180 [scsi_mod]
[<ffffffff81098eb8>] kthread+0xd8/0xf0
[<ffffffff815d913f>] ret_from_fork+0x1f/0x40
[<ffffffff81098de0>] ? kthread_worker_fn+0x170/0x170
---[ end trace 8b7501047e928a17 ]---
Removed the unnecessary code and let ata_scsi_translate() do the job.
Also, since ata_mselect_control() has no ATA command to send to the
device, ata_scsi_mode_select_xlat() should return 1 for it, so that
ata_scsi_translate() will finish early to avoid ata_qc_issue().
Signed-off-by: Tom Yan <tom.ty89@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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ata_mselect_*() would initialize a char array for storing a copy of
the current mode page. However, char could be signed char. In that
case, bytes larger than 127 would be converted to negative number.
For example, 0xff from def_control_mpage[] would become -1. This
prevented ata_mselect_control() from working at all, since when it
did the read-only bits check, there would always be a mismatch.
Signed-off-by: Tom Yan <tom.ty89@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Pull more SCSI updates from James Bottomley:
"This is just a set of minor updates and fixes which weren't quite
ready in time for the first pull request.
The only real thing of note is Mike Christie is stepping down as
Maintainer of iscsi to be replaced by Lee Duncan and Chris Leech"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: ufs: Kconfig fix
scsi: g_NCR5380: Stop using scsi_module.c
scsi: g_NCR5380: Reduce overrides[] from array to struct
scsi: g_NCR5380: Remove deprecated __setup
scsi: ufs: Fix error return code in ufshcd_init()
scsi: ufs: Data Segment only needed for WRITE DESCRIPTOR
scsi: cxgb4i: Set completion bit in work request
MAINTAINERS: Update open-iscsi maintainers
scsi: ufs: Enable no vccq quirk for skhynix device
scsi: be2iscsi: mark symbols static where possible
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Currently if we have PCI and UFSHCD configured in the kernel, both
SCSI_UFS_DWC_TC_PCI and SCSI_UFSHCD_PCI show up, which is not correct.
This patch changes the UFS Kconfig to assure hierarchy between the 2
options.
Signed-off-by: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Convert g_NCR5380 to use scsi_add_host instead of scsi_module.c Use
pnp_driver and isa_driver to manage cards.
In order to support multiple cards, new module parameter format is
introduced. The old parameters are kept for compatibility.
Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Remove compile-time card type definition GENERIC_NCR5380_OVERRIDE. Then
remove all code iterating the overrides[] array and reduce it to struct
card.
Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Remove deprecated __setup for parsing command line parameters.
g_NCR5380.* parameters could be used instead.
This might break existing setups with g_NCR5380 built-in (if there are
any). But it has to go in order to remove the overrides[] array.
Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Fix to return a negative error code from the error handling case instead
of 0, as done elsewhere in this function.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Some devices have problems handling a Query UPIU with Data Segment
set. Only set it for WRITE DESCRIPTOR commands.
[mkp: updated patch description]
Signed-off-by: Zang Leigang <zangleigang@hisilicon.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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If SKCBF_TX_FLAG_COMPL flag is set and unacknowledged credits are >= max
credits / 2, set completion bit in work request to reclaim credits.
Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Chris Leech and I are taking over as open-iscsi maintainers.
Signed-off-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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This patch enable no vccq quirk for SKHynix devices. SKHynix ufs device
don't need vccq vrail for device operation.
Signed-off-by: Kyuho Choi <kyuho.choi@sk.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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We get 6 warnings when building kernel with W=1:
drivers/scsi/be2iscsi/be_main.c:65:1: warning: no previous prototype for 'beiscsi_log_enable_disp' [-Wmissing-prototypes]
drivers/scsi/be2iscsi/be_main.c:78:1: warning: no previous prototype for 'beiscsi_log_enable_change' [-Wmissing-prototypes]
drivers/scsi/be2iscsi/be_main.c:97:1: warning: no previous prototype for 'beiscsi_log_enable_store' [-Wmissing-prototypes]
drivers/scsi/be2iscsi/be_main.c:116:1: warning: no previous prototype for 'beiscsi_log_enable_init' [-Wmissing-prototypes]
drivers/scsi/be2iscsi/be_main.c:4587:5: warning: no previous prototype for 'beiscsi_iotask_v2' [-Wmissing-prototypes]
drivers/scsi/be2iscsi/be_main.c:4976:6: warning: no previous prototype for 'beiscsi_hba_attrs_init' [-Wmissing-prototypes]
In fact, these functions are only used in the file in which they are
declared and don't need a declaration, but can be made static. So this
patch marks these functions with 'static'.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Reviewed-by: Jitendra Bhivare <Jitendra.bhivare@broadcom>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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This easy-to-trigger warning shows up instantly when running
Trinity on a kernel with CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS disabled.
At most this should have been a printk, but the -EINVAL alone should be more
than adequate indicator that something isn't available.
Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag
Pull metag architecture fix from James Hogan:
"A simple build fix for irqsoff atomics which has started hitting
meta1_defconfig during the 4.9 merge window"
* tag 'metag-for-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag:
metag: Only define atomic_dec_if_positive conditionally
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The definition of atomic_dec_if_positive() assumes that
atomic_sub_if_positive() exists, which is only the case if
metag specific atomics are used. This results in the following
build error when trying to build metag1_defconfig.
kernel/ucount.c: In function 'dec_ucount':
kernel/ucount.c:211: error:
implicit declaration of function 'atomic_sub_if_positive'
Moving the definition of atomic_dec_if_positive() into the metag
conditional code fixes the problem.
Fixes: 6006c0d8ce94 ("metag: Atomics, locks and bitops")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: <stable@vger.kernel.org> # 3.9.x-
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull more powerpc updates from Michael Ellerman:
"Some more powerpc updates for 4.9:
Freescale updates from Scott Wood:
- qbman support (a prerequisite for datapath drivers such as ethernet)
- a PCI DMA fix+improvement
- reset handler changes
- more 8xx optimizations
- some cleanups and fixes.'
Fixes:
- selftests/powerpc: Add missing binaries to .gitignores (Michael Ellerman)
- selftests/powerpc: Fix build break caused by EXPORT_SYMBOL changes (Michael Ellerman)
- powerpc/pseries: Fix stack corruption in htpe code (Laurent Dufour)
- powerpc/64s: Fix power4_fixup_nap placement (Nicholas Piggin)
- powerpc/64: Fix incorrect return value from __copy_tofrom_user (Paul Mackerras)
- powerpc/mm/hash64: Fix might_have_hea() check (Michael Ellerman)
Other:
- MAINTAINERS: Remove myself from PA Semi entries (Olof Johansson)
- MAINTAINERS: Drop separate pseries entry (Michael Ellerman)
- MAINTAINERS: Update powerpc website & add selftests (Michael Ellerman):
* tag 'powerpc-4.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (35 commits)
powerpc/mm/hash64: Fix might_have_hea() check
powerpc/64: Fix incorrect return value from __copy_tofrom_user
powerpc/64s: Fix power4_fixup_nap placement
powerpc/pseries: Fix stack corruption in htpe code
selftests/powerpc: Fix build break caused by EXPORT_SYMBOL changes
MAINTAINERS: Update powerpc website & add selftests
MAINTAINERS: Drop separate pseries entry
MAINTAINERS: Remove myself from PA Semi entries
selftests/powerpc: Add missing binaries to .gitignores
arch/powerpc: Add CONFIG_FSL_DPAA to corenetXX_smp_defconfig
soc/qman: Add self-test for QMan driver
soc/bman: Add self-test for BMan driver
soc/fsl: Introduce DPAA 1.x QMan device driver
soc/fsl: Introduce DPAA 1.x BMan device driver
powerpc/8xx: make user addr DTLB miss the short path
powerpc/8xx: Move additional DTLBMiss handlers out of exception area
powerpc/8xx: use r3 to scratch CR in ITLBmiss
soc/fsl/qe: fix gpio save_regs functions
powerpc/8xx: add dedicated machine check handler
powerpc/8xx: add system_reset_exception
...
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In commit 2b4e3ad8f579 ("powerpc/mm/hash64: Don't test for machine type
to detect HEA special case") we changed the logic in might_have_hea()
to check FW_FEATURE_SPLPAR rather than machine_is(pseries).
However the check was incorrectly negated, leading to crashes on
machines with HEA adapters, such as:
mm: Hashing failure ! EA=0xd000080080004040 access=0x800000000000000e current=NetworkManager
trap=0x300 vsid=0x13d349c ssize=1 base psize=2 psize 2 pte=0xc0003cc033e701ae
Unable to handle kernel paging request for data at address 0xd000080080004040
Call Trace:
.ehea_create_cq+0x148/0x340 [ehea] (unreliable)
.ehea_up+0x258/0x1200 [ehea]
.ehea_open+0x44/0x1a0 [ehea]
...
Fix it by removing the negation.
Fixes: 2b4e3ad8f579 ("powerpc/mm/hash64: Don't test for machine type to detect HEA special case")
Cc: stable@vger.kernel.org # v4.8+
Reported-by: Denis Kirjanov <kda@linux-powerpc.org>
Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Debugging a data corruption issue with virtio-net/vhost-net led to
the observation that __copy_tofrom_user was occasionally returning
a value 16 larger than it should. Since the return value from
__copy_tofrom_user is the number of bytes not copied, this means
that __copy_tofrom_user can occasionally return a value larger
than the number of bytes it was asked to copy. In turn this can
cause higher-level copy functions such as copy_page_to_iter_iovec
to corrupt memory by copying data into the wrong memory locations.
It turns out that the failing case involves a fault on the store
at label 79, and at that point the first unmodified byte of the
destination is at R3 + 16. Consequently the exception handler
for that store needs to add 16 to R3 before using it to work out
how many bytes were not copied, but in this one case it was not
adding the offset to R3. To fix it, this moves the label 179 to
the point where we add 16 to R3. I have checked manually all the
exception handlers for the loads and stores in this code and the
rest of them are correct (it would be excellent to have an
automated test of all the exception cases).
This bug has been present since this code was initially
committed in May 2002 to Linux version 2.5.20.
Cc: stable@vger.kernel.org
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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power4_fixup_nap is called from the "common" handlers, not the virt/real
handlers, therefore it should itself be a common handler. Placing it
down in the trampoline space caused it to go out of reach of its
callers, requiring a trampoline inserted at the start of the text
section, which breaks the fixed section address calculations.
Fixes: da2bc4644c75 ("powerpc/64s: Add new exception vector macros")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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