[PATCH v3 16/18] arm64: sync_icache_aliases to take end parameter instead of size

Fuad Tabba
2021-05-20T12:52:44Z

To be consistent with other functions with similar names and
functionality in cacheflush.h, cache.S, and cachetlb.rst, change
to specify the range in terms of start and end, as opposed to
start and size.

No functional change intended.

Reported-by: Will Deacon <will@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
---
arch/arm64/include/asm/cacheflush.h | 2 +-
arch/arm64/kernel/probes/uprobes.c | 2 +-
arch/arm64/mm/flush.c | 21 +++++++++++----------
3 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index f86723047315..70b389a8dea5 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -64,7 +64,7 @@ extern void __clean_dcache_area_poc(unsigned long start, unsigned long end);
extern void __clean_dcache_area_pop(unsigned long start, unsigned long end);
extern void __clean_dcache_area_pou(unsigned long start, unsigned long end);
extern long __flush_cache_user_range(unsigned long start, unsigned long end);
-extern void sync_icache_aliases(void *kaddr, unsigned long len);
+extern void sync_icache_aliases(unsigned long start, unsigned long end);

static inline void flush_icache_range(unsigned long start, unsigned long end)
{
diff --git a/arch/arm64/kernel/probes/uprobes.c b/arch/arm64/kernel/probes/uprobes.c
index 2c247634552b..9be668f3f034 100644
--- a/arch/arm64/kernel/probes/uprobes.c
+++ b/arch/arm64/kernel/probes/uprobes.c
@@ -21,7 +21,7 @@ void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
memcpy(dst, src, len);

/* flush caches (dcache/icache) */
- sync_icache_aliases(dst, len);
+ sync_icache_aliases((unsigned long)dst, (unsigned long)dst + len);

kunmap_atomic(xol_page_kaddr);
}
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index a69d745fb1dc..143f625e7727 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -14,28 +14,26 @@
#include <asm/cache.h>
#include <asm/tlbflush.h>

-void sync_icache_aliases(void *kaddr, unsigned long len)
+void sync_icache_aliases(unsigned long start, unsigned long end)
{
- unsigned long addr = (unsigned long)kaddr;
-
if (icache_is_aliasing()) {
- __clean_dcache_area_pou(kaddr, kaddr + len);
+ __clean_dcache_area_pou(start, end);
__flush_icache_all();
} else {
/*
* Don't issue kick_all_cpus_sync() after I-cache invalidation
* for user mappings.
*/
- __flush_icache_range(addr, addr + len);
+ __flush_icache_range(start, end);
}
}

static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
- unsigned long uaddr, void *kaddr,
- unsigned long len)
+ unsigned long uaddr, unsigned long start,
+ unsigned long end)
{
if (vma->vm_flags & VM_EXEC)
- sync_icache_aliases(kaddr, len);
+ sync_icache_aliases(start, end);
}

/*
@@ -48,7 +46,8 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long len)
{
memcpy(dst, src, len);
- flush_ptrace_access(vma, page, uaddr, dst, len);
+ flush_ptrace_access(vma, page, uaddr, (unsigned long)dst,
+ (unsigned long)dst + len);
}

void __sync_icache_dcache(pte_t pte)
@@ -56,7 +55,9 @@ void __sync_icache_dcache(pte_t pte)
struct page *page = pte_page(pte);

if (!test_and_set_bit(PG_dcache_clean, &page->flags))
- sync_icache_aliases(page_address(page), page_size(page));
+ sync_icache_aliases((unsigned long)page_address(page),
+ (unsigned long)page_address(page) +
+ page_size(page));
}
EXPORT_SYMBOL_GPL(__sync_icache_dcache);

--
2.31.1.751.gd2f1c929bd-goog