diff options
| author | James Hogan <james.hogan@imgtec.com> | 2016-09-01 19:30:13 +0300 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-10-04 17:13:57 +0300 |
| commit | d99a043a9a506290a0aac6746a8e412df3dafbfb (patch) | |
| tree | dfcda71fb7f0c1d293888cd0a6b76cc7f0a39111 /arch | |
| parent | 8e3a9f4c3ab6dd0da5e8a89bd252518ff2ee5e3a (diff) | |
| download | linux-d99a043a9a506290a0aac6746a8e412df3dafbfb.tar.xz | |
MIPS: uprobes: Flush icache via kernel address
Update arch_uprobe_copy_ixol() to use the kmap_atomic() based kernel
address to flush the icache with flush_icache_range(), rather than the
user mapping. We have the kernel mapping available anyway and this
avoids having to switch to using the new __flush_icache_user_range() for
the sake of Enhanced Virtual Addressing (EVA) where flush_icache_range()
will become ineffective on user addresses.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14154/
Patchwork: https://patchwork.linux-mips.org/patch/14308/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/kernel/uprobes.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/arch/mips/kernel/uprobes.c b/arch/mips/kernel/uprobes.c index 4c7c1558944a..15ad17cb2b6e 100644 --- a/arch/mips/kernel/uprobes.c +++ b/arch/mips/kernel/uprobes.c @@ -282,19 +282,14 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, void __weak arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr, void *src, unsigned long len) { - void *kaddr; + unsigned long kaddr, kstart; /* Initialize the slot */ - kaddr = kmap_atomic(page); - memcpy(kaddr + (vaddr & ~PAGE_MASK), src, len); - kunmap_atomic(kaddr); - - /* - * The MIPS version of flush_icache_range will operate safely on - * user space addresses and more importantly, it doesn't require a - * VMA argument. - */ - flush_icache_range(vaddr, vaddr + len); + kaddr = (unsigned long)kmap_atomic(page); + kstart = kaddr + (vaddr & ~PAGE_MASK); + memcpy((void *)kstart, src, len); + flush_icache_range(kstart, kstart + len); + kunmap_atomic((void *)kaddr); } /** |