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authorNathan Fontenot <nfont@linux.vnet.ibm.com>2017-02-25 00:00:02 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-25 02:46:56 +0100
commitdc18d706a4367454ad1fc51e06148d54e8ecfaa0 (patch)
treec72bb090e93017548b6f50537883e151caf87ac4 /drivers/base/memory.c
parentmm: do not access page->mapping directly on page_endio (diff)
downloadlinux-dc18d706a4367454ad1fc51e06148d54e8ecfaa0.tar.xz
linux-dc18d706a4367454ad1fc51e06148d54e8ecfaa0.zip
memory-hotplug: use dev_online for memhp_auto_online
Commit 31bc3858ea3e ("add automatic onlining policy for the newly added memory") provides the capability to have added memory automatically onlined during add, but this appears to be slightly broken. The current implementation uses walk_memory_range() to call online_memory_block, which uses memory_block_change_state() to online the memory. Instead, we should be calling device_online() for the memory block in online_memory_block(). This would online the memory (the memory bus online routine memory_subsys_online() called from device_online calls memory_block_change_state()) and properly update the device struct offline flag. As a result of the current implementation, attempting to remove a memory block after adding it using auto online fails. This is because doing a remove, for instance echo offline > /sys/devices/system/memory/memoryXXX/state uses device_offline() which checks the dev->offline flag. Link: http://lkml.kernel.org/r/20170222220744.8119.19687.stgit@ltcalpine2-lp14.aus.stglabs.ibm.com Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base/memory.c')
-rw-r--r--drivers/base/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index fa26ffd25fa6..cc4f1d0cbffe 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -249,7 +249,7 @@ memory_block_action(unsigned long phys_index, unsigned long action, int online_t
return ret;
}
-int memory_block_change_state(struct memory_block *mem,
+static int memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req)
{
int ret = 0;