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321d628a FG |
1 | From 2f76ec868c18486b60f1b76428339a2fa0c2e5d8 Mon Sep 17 00:00:00 2001 |
2 | From: Andi Kleen <ak@linux.intel.com> | |
3 | Date: Fri, 13 Oct 2017 14:56:41 -0700 | |
e4cdf2a5 | 4 | Subject: [PATCH 065/241] bitops: Add clear/set_bit32() to linux/bitops.h |
321d628a FG |
5 | MIME-Version: 1.0 |
6 | Content-Type: text/plain; charset=UTF-8 | |
7 | Content-Transfer-Encoding: 8bit | |
8 | ||
9 | CVE-2017-5754 | |
10 | ||
11 | Add two simple wrappers around set_bit/clear_bit() that accept | |
12 | the common case of an u32 array. This avoids writing | |
13 | casts in all callers. | |
14 | ||
15 | Signed-off-by: Andi Kleen <ak@linux.intel.com> | |
16 | Reviewed-by: Thomas Gleixner <tglx@linutronix.de> | |
17 | Cc: Linus Torvalds <torvalds@linux-foundation.org> | |
18 | Cc: Peter Zijlstra <peterz@infradead.org> | |
19 | Link: http://lkml.kernel.org/r/20171013215645.23166-2-andi@firstfloor.org | |
20 | Signed-off-by: Ingo Molnar <mingo@kernel.org> | |
21 | (cherry picked from commit cbe96375025e14fc76f9ed42ee5225120d7210f8) | |
22 | Signed-off-by: Andy Whitcroft <apw@canonical.com> | |
23 | Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com> | |
24 | (cherry picked from commit 06d31c11519ca0e8f9b7cab857f442ef44dfc1b2) | |
25 | Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> | |
26 | --- | |
27 | include/linux/bitops.h | 26 ++++++++++++++++++++++++++ | |
28 | 1 file changed, 26 insertions(+) | |
29 | ||
30 | diff --git a/include/linux/bitops.h b/include/linux/bitops.h | |
31 | index a83c822c35c2..eb257a96db6d 100644 | |
32 | --- a/include/linux/bitops.h | |
33 | +++ b/include/linux/bitops.h | |
34 | @@ -226,6 +226,32 @@ static inline unsigned long __ffs64(u64 word) | |
35 | return __ffs((unsigned long)word); | |
36 | } | |
37 | ||
38 | +/* | |
39 | + * clear_bit32 - Clear a bit in memory for u32 array | |
40 | + * @nr: Bit to clear | |
41 | + * @addr: u32 * address of bitmap | |
42 | + * | |
43 | + * Same as clear_bit, but avoids needing casts for u32 arrays. | |
44 | + */ | |
45 | + | |
46 | +static __always_inline void clear_bit32(long nr, volatile u32 *addr) | |
47 | +{ | |
48 | + clear_bit(nr, (volatile unsigned long *)addr); | |
49 | +} | |
50 | + | |
51 | +/* | |
52 | + * set_bit32 - Set a bit in memory for u32 array | |
53 | + * @nr: Bit to clear | |
54 | + * @addr: u32 * address of bitmap | |
55 | + * | |
56 | + * Same as set_bit, but avoids needing casts for u32 arrays. | |
57 | + */ | |
58 | + | |
59 | +static __always_inline void set_bit32(long nr, volatile u32 *addr) | |
60 | +{ | |
61 | + set_bit(nr, (volatile unsigned long *)addr); | |
62 | +} | |
63 | + | |
64 | #ifdef __KERNEL__ | |
65 | ||
66 | #ifndef set_mask_bits | |
67 | -- | |
68 | 2.14.2 | |
69 |