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| author | Alastair D'Silva <alastair@d-silva.org> | 2019-11-04 13:32:54 +1100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2020-02-11 20:03:34 +0000 |
| commit | c24394f71b4a52b34862b3437eb0380575dea0c5 (patch) | |
| tree | 7a8abcf67ededadb84b0a189ece7512f61b3c2a4 /arch | |
| parent | 0a823bbf75f9e0327df3d89877e917bd38fafa64 (diff) | |
| download | linux-stable-c24394f71b4a52b34862b3437eb0380575dea0c5.tar.gz linux-stable-c24394f71b4a52b34862b3437eb0380575dea0c5.tar.bz2 linux-stable-c24394f71b4a52b34862b3437eb0380575dea0c5.zip | |
powerpc: Allow 64bit VDSO __kernel_sync_dicache to work across ranges >4GB
commit f9ec11165301982585e5e5f606739b5bae5331f3 upstream.
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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191104023305.9581-3-alastair@au1.ibm.com
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/vdso64/cacheflush.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/vdso64/cacheflush.S b/arch/powerpc/kernel/vdso64/cacheflush.S index 69c5af2b3c96..228a4a2383d6 100644 --- a/arch/powerpc/kernel/vdso64/cacheflush.S +++ b/arch/powerpc/kernel/vdso64/cacheflush.S @@ -39,7 +39,7 @@ 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 @@ -56,7 +56,7 @@ 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 |