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powerpc/32s: Implement local_flush_tlb_page_psize()

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There's a single call to local_flush_tlb_page_psize() in the code
patching code. That call is never executed on 32-bit Book3S,
because it's guarded by mm_patch_enabled() which is essentially a
radix_enabled() check, which is always false on 32s.

However depending on how the optimiser sees things it may still trip
over the BUILD_BUG() in the 32s stub of local_flush_tlb_page_psize().

To avoid that, implement it in terms of flush_range() so that if it ever
becomes called it should function, even if not optimally.

Note that flush_range() deals with page aligning the address and so on,
and that 32s doesn't support huge pages so there should be no issue with
non-standard page sizes needing to be flushed.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231023092319.1507325-1-mpe@ellerman.id.au
This commit is contained in:
Michael Ellerman 2023-10-23 20:23:19 +11:00
parent ca2b746d5f
commit aad26d3b6a
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/include/asm/book3s/32/tlbflush.h
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@ -80,7 +80,7 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma,
static inline void local_flush_tlb_page_psize(struct mm_struct *mm,
unsigned long vmaddr, int psize)
{
BUILD_BUG();
flush_range(mm, vmaddr, vmaddr);
}
static inline void local_flush_tlb_mm(struct mm_struct *mm)