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powerpc: Allow 64bit VDSO __kernel_sync_dicache to work across ranges >4GB 

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
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191104023305.9581-3-alastair@au1.ibm.com
alistair/sunxi64-5.5-dsi
Alastair D'Silva 2019-11-04 13:32:54 +11:00 committed by Michael Ellerman
parent 29430fae82
commit f9ec111653
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/kernel/vdso64/cacheflush.S
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@ -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