This is a note to let you know that I've just added the patch titled
MIPS: vdso: Utilize __pa() for gic_pfn
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-vdso-utilize-__pa-for-gic_pfn.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 81e18604e10523b98eeede03d6feb7689b46162c
Author: Florian Fainelli <f.fainelli@xxxxxxxxx>
Date: Thu Jul 7 13:27:58 2022 -0700
MIPS: vdso: Utilize __pa() for gic_pfn
[ Upstream commit 8baa65126e19af5ee9f3c07e7bb53da41c39e4b1 ]
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@xxxxxxxxxx>
Suggested-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Fixes: dfad83cb7193 ("MIPS: Add support for CONFIG_DEBUG_VIRTUAL")
Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Acked-by: Greg Ungerer <gerg@xxxxxxxxxx>
Tested-by: Greg Ungerer <gerg@xxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c
index 3d0cf471f2fe..b2cc2c2dd4bf 100644
--- a/arch/mips/kernel/vdso.c
+++ b/arch/mips/kernel/vdso.c
@@ -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));
