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Groups > linux.kernel > #1247974
| From | Martin Kepplinger <martink@posteo.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | bitops.h: improve sign extending API |
| Date | 2015-10-15 18:30 +0200 |
| Message-ID | <qjTzI-3md-11@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
PATCH 1/2 improves the doc of sign_extend32()
This should help to avoid different manual approaches to sign extension
PATCH 2/2 adds sign_extend64()
An informal example of what could follow in
arch/sh/kernel/traps_64.c after PATCH 2/2:
@@ -101,7 +102,7 @@ static int generate_and_check_address(struct pt_regs *regs,
__s64 displacement;
displacement = (opcode >> 10) & 0x3ff;
- displacement = ((displacement << 54) >> 54); /* sign extend */
+ displacement = sign_extend64(displacement, 9);
addr = (__u64)((__s64)base_address + (displacement << width_shift));
} else {
--
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bitops.h: improve sign extending API Martin Kepplinger <martink@posteo.de> - 2015-10-15 18:30 +0200
[PATCH 2/2] bitops.h: add sign_extend64() Martin Kepplinger <martink@posteo.de> - 2015-10-15 18:30 +0200
[PATCH 1/2] bitops.h: Improve sign_extend32()'s documentation Martin Kepplinger <martink@posteo.de> - 2015-10-15 18:30 +0200
Re: [PATCH 1/2] bitops.h: Improve sign_extend32()'s documentation "George Spelvin" <linux@horizon.com> - 2015-10-15 20:10 +0200
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