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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2018-01-12 13:45:25 +0100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-01-16 23:47:13 +1100 |
| commit | 5f356497c38448874f2d491cd214e9c283f5592d (patch) | |
| tree | e28807f19159c48b88ad504788b7f294b857a0f7 /arch/powerpc/kernel/head_8xx.S | |
| parent | powerpc/8xx: Only perform perf counting when perf is in use. (diff) | |
| download | linux-dev-5f356497c38448874f2d491cd214e9c283f5592d.tar.xz linux-dev-5f356497c38448874f2d491cd214e9c283f5592d.zip | |
powerpc/8xx: remove unused _PAGE_WRITETHRU
_PAGE_WRITETHRU is only used in:
* AMIGA_Z2RAM block driver which is never activated on powerPC
* Video/FB driver which is for PPC_PMAC
Therefore, no need to spend time in 8xx TLB miss handlers for
handling it.
And by removing it, we free up bit 20 which then avoids having
to clear it on each TLB miss.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/head_8xx.S')
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 641c9a9d4db2..6399dcadf51d 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -486,10 +486,6 @@ _ENTRY(DTLBMiss_jmp) * above. */ rlwimi r11, r10, 0, 26, 27 - /* Insert the WriteThru flag into the TWC from the Linux PTE. - * It is bit 25 in the Linux PTE and bit 30 in the TWC - */ - rlwimi r11, r10, 32-5, 30, 30 mtspr SPRN_MD_TWC, r11 /* In 4k pages mode, SPS (bit 28) in RPN must match PS[1] (bit 29) @@ -523,7 +519,6 @@ _ENTRY(DTLBMiss_jmp) #else rlwimi r10, r11, 0, 24, 28 /* Set 24-27, clear 28 */ #endif - rlwimi r10, r11, 0, 20, 20 /* clear 20 */ mtspr SPRN_MD_RPN, r10 /* Update TLB entry */ /* Restore registers */ |