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authorLinus Torvalds <torvalds@linux-foundation.org>2016-03-06 20:08:06 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-06 20:08:06 +0100
commitb8155fe1b2963ab2c53140929eb2362afcb9ccfe (patch)
tree5e63f57ce23f68094676205059bb53df4b7b5ec3 /arch/powerpc
parentMerge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/g... (diff)
parentpowerpc/fsl-book3e: Avoid lbarx on e5500 (diff)
downloadlinux-b8155fe1b2963ab2c53140929eb2362afcb9ccfe.tar.xz
linux-b8155fe1b2963ab2c53140929eb2362afcb9ccfe.zip
Merge tag 'powerpc-4.5-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman: - cxl: Fix PSL timebase synchronization detection from Frederic Barrat - Fix oops when destroying hw_breakpoint event from Ravi Bangoria - Avoid lbarx on e5500 from Scott Wood * tag 'powerpc-4.5-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/fsl-book3e: Avoid lbarx on e5500 powerpc/hw_breakpoint: Fix oops when destroying hw_breakpoint event cxl: Fix PSL timebase synchronization detection
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/hw_breakpoint.c3
-rw-r--r--arch/powerpc/mm/hugetlbpage-book3e.c13
2 files changed, 15 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index 05e804cdecaa..aec9a1b1d25b 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -109,8 +109,9 @@ void arch_unregister_hw_breakpoint(struct perf_event *bp)
* If the breakpoint is unregistered between a hw_breakpoint_handler()
* and the single_step_dabr_instruction(), then cleanup the breakpoint
* restoration variables to prevent dangling pointers.
+ * FIXME, this should not be using bp->ctx at all! Sayeth peterz.
*/
- if (bp->ctx && bp->ctx->task)
+ if (bp->ctx && bp->ctx->task && bp->ctx->task != ((void *)-1L))
bp->ctx->task->thread.last_hit_ubp = NULL;
}
diff --git a/arch/powerpc/mm/hugetlbpage-book3e.c b/arch/powerpc/mm/hugetlbpage-book3e.c
index 7e6d0880813f..83a8be791e06 100644
--- a/arch/powerpc/mm/hugetlbpage-book3e.c
+++ b/arch/powerpc/mm/hugetlbpage-book3e.c
@@ -8,6 +8,8 @@
#include <linux/mm.h>
#include <linux/hugetlb.h>
+#include <asm/mmu.h>
+
#ifdef CONFIG_PPC_FSL_BOOK3E
#ifdef CONFIG_PPC64
static inline int tlb1_next(void)
@@ -60,6 +62,14 @@ static inline void book3e_tlb_lock(void)
unsigned long tmp;
int token = smp_processor_id() + 1;
+ /*
+ * Besides being unnecessary in the absence of SMT, this
+ * check prevents trying to do lbarx/stbcx. on e5500 which
+ * doesn't implement either feature.
+ */
+ if (!cpu_has_feature(CPU_FTR_SMT))
+ return;
+
asm volatile("1: lbarx %0, 0, %1;"
"cmpwi %0, 0;"
"bne 2f;"
@@ -80,6 +90,9 @@ static inline void book3e_tlb_unlock(void)
{
struct paca_struct *paca = get_paca();
+ if (!cpu_has_feature(CPU_FTR_SMT))
+ return;
+
isync();
paca->tcd_ptr->lock = 0;
}