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Replace P2ALIGN with P2ALIGN_TYPED and delete P2ALIGN.

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In P2ALIGN, the result would be incorrect when align is unsigned
integer and x is larger than max value of the type of align.
In that case, -(align) would be a positive integer, which means
high bits would be zero and finally stay zero after '&' when
align is converted to a larger integer type.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Youzhong Yang <yyang@mathworks.com>
Signed-off-by: Qiuhao Chen <chenqiuhao1997@gmail.com>
Closes #15940
This commit is contained in:
chenqiuhao1997
2024-05-10 23:47:21 +08:00
committed by GitHub
parent 1ede0c716b
commit 41ae864b69
17 changed files with 44 additions and 31 deletions
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include/os/freebsd/spl/sys/sysmacros.h
+2 -1
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@@ -191,7 +191,8 @@ extern unsigned char bcd_to_byte[256];
* eg, P2ALIGN(0x1234, 0x100) == 0x1200 (0x12*align)
* eg, P2ALIGN(0x5600, 0x100) == 0x5600 (0x56*align)
*/
#define P2ALIGN(x, align) ((x) & -(align))
// Deprecated. Use P2ALIGN_TYPED instead.
// #define P2ALIGN(x, align) ((x) & -(align))
/*
* return x % (mod) align