Messages in this thread Patch in this message | | | From | "Alastair D'Silva" <> | Subject | [PATCH v5 2/6] powerpc: Allow 64bit VDSO __kernel_sync_dicache to work across ranges >4GB | Date | Mon, 4 Nov 2019 13:32:54 +1100 |
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From: Alastair D'Silva <alastair@d-silva.org>
When calling __kernel_sync_dicache with a size >4GB, we were masking off the upper 32 bits, so we would incorrectly flush a range smaller than intended.
This patch replaces the 32 bit shifts with 64 bit ones, so that the full size is accounted for.
Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Cc: stable@vger.kernel.org --- arch/powerpc/kernel/vdso64/cacheflush.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/vdso64/cacheflush.S b/arch/powerpc/kernel/vdso64/cacheflush.S index 3f92561a64c4..526f5ba2593e 100644 --- a/arch/powerpc/kernel/vdso64/cacheflush.S +++ b/arch/powerpc/kernel/vdso64/cacheflush.S @@ -35,7 +35,7 @@ V_FUNCTION_BEGIN(__kernel_sync_dicache) subf r8,r6,r4 /* compute length */ add r8,r8,r5 /* ensure we get enough */ lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10) - srw. r8,r8,r9 /* compute line count */ + srd. r8,r8,r9 /* compute line count */ crclr cr0*4+so beqlr /* nothing to do? */ mtctr r8 @@ -52,7 +52,7 @@ V_FUNCTION_BEGIN(__kernel_sync_dicache) subf r8,r6,r4 /* compute length */ add r8,r8,r5 lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10) - srw. r8,r8,r9 /* compute line count */ + srd. r8,r8,r9 /* compute line count */ crclr cr0*4+so beqlr /* nothing to do? */ mtctr r8 -- 2.21.0
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