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MIPS: vdso: Utilize __pa() for gic_pfn

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[ Upstream commit 8baa65126e ]

The GIC user offset is mapped into every process' virtual address and is
therefore part of the hot-path of arch_setup_additional_pages(). Utilize
__pa() such that we are more optimal even when CONFIG_DEBUG_VIRTUAL is
enabled, and while at it utilize PFN_DOWN() instead of open-coding the
right shift by PAGE_SHIFT.

Reported-by: Greg Ungerer <gerg@kernel.org>
Suggested-by: Serge Semin <fancer.lancer@gmail.com>
Fixes: dfad83cb71 ("MIPS: Add support for CONFIG_DEBUG_VIRTUAL")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Greg Ungerer <gerg@kernel.org>
Tested-by: Greg Ungerer <gerg@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Florian Fainelli 2022-07-07 13:27:58 -07:00 committed by Greg Kroah-Hartman
parent 447e0f4be8
commit 80f697b57f
1 changed files with 1 additions and 1 deletions
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2
arch/mips/kernel/vdso.c
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@ -159,7 +159,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
/* Map GIC user page. */
if (gic_size) {
gic_base = (unsigned long)mips_gic_base + MIPS_GIC_USER_OFS;
gic_pfn = virt_to_phys((void *)gic_base) >> PAGE_SHIFT;
gic_pfn = PFN_DOWN(__pa(gic_base));
ret = io_remap_pfn_range(vma, base, gic_pfn, gic_size,
pgprot_noncached(vma->vm_page_prot));