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Date: Thu, 13 Oct 2016 17:25:53 +0000
From: "Reshetova, Elena" <elena.reshetova@...el.com>
To: Colin Vidal <colin@...dal.org>, "kernel-hardening@...ts.openwall.com"
<kernel-hardening@...ts.openwall.com>, AKASHI Takahiro
<takahiro.akashi@...aro.org>
Subject: RE: atomic64_wrap_t generic implementation
Hi Colin,
diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h index dad68bf..4987419 100644
--- a/include/asm-generic/atomic64.h
+++ b/include/asm-generic/atomic64.h
@@ -16,6 +16,8 @@ typedef struct {
long long counter;
} atomic64_t;
+typedef atomic64_t atomic64_wrap_t;
+
#define ATOMIC64_INIT(i) { (i) }
extern long long atomic64_read(const atomic64_t *v); @@ -62,4 +64,15 @@ extern int atomic64_add_unless(atomic64_t *v, long long a, long long u);
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL)
+#define atomic64_read_wrap(v) atomic64_read(v) #define
+atomic64_set_wrap(v, i) atomic64_set((v), (i)) #define
+atomic64_add_wrap(a, v) atomic64_add((a), (v)) #define
+atomic64_add_return_wrap(a, v) atomic64_add_return((a), (v)) #define
+atomic64_sub_wrap(a, v) atomic64_sub((a), (v)) #define
+atomic64_inc_wrap(v) atomic64_inc(v) #define
+atomic64_inc_return_wrap(v) atomic64_inc_return(v) #define
+atomic64_dec_wrap(v) atomic64_dec(v) #define atomic64_cmpxchg_wrap(v,
+o, n) atomic64_cmpxchg((v), (o), (n)) #define atomic64_xchg_wrap(v, n)
+atomic64_xchg((v), (n))
>Isen't there a type error ? For instance:
>atomic64_wrap_t atom_wrap;
>atomic64_read_wrap(atom_wrap) will be expanded into atomic64_read(atom_wrap), which would lead to a type error (atomic64_t expected).
I have been double checking this now and I think for x86, all the changes in asm-generic/atomic64.h are not needed.
X86 overrides them with arch. specific implementations in include/asm/atomic64_64.h and include/asm/atomic64_32.h
Takahiro, you have been looking into arm. Are the above ones used in any way in arm or can we simply get rid of the whole bundle of changes?
Best Regards,
Elena.
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