Author: Matthew Wilcox <matthew@wil.cx> On Fri, Apr 18, 2008 at 09:08:55PM +0200, Julia Lawall wrote: > I found 63 occurrences of this problem with the following semantic match > (http://www.emn.fr/x-info/coccinelle/): > > @@ unsigned int i; @@ > > * i < 0 > Since this one’s always in the range 0-255, it could probably …
Category: Linux
Apr 30 2008
drivers/char/ds1286.c: use time_before, time_before_eq, etc
Author: Julia Lawall <julia@diku.dk> The functions time_before, time_before_eq, time_after, and time_after_eq are more robust for comparing jiffies against other values. A simplified version of the semantic patch making this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ change_compare_np @ expression E; @@ ( – jiffies = E + time_after_eq(jiffies,E) | – jiffies < E + time_before(jiffies,E) …
Apr 29 2008
drivers/misc: elide a non-zero test on a result that is never 0
Author: Julia Lawall <julia@diku.dk> The function thermal_cooling_device_register always returns either a valid pointer or a value made with ERR_PTR, so a test for non-zero on the result will always succeed. The problem was found using the following semantic match. (http://www.emn.fr/x-info/coccinelle/) // @a@ expression E, E1; statement S,S1; position p; @@ E = thermal_cooling_device_register(…) … when …
Apr 29 2008
fs/affs/file.c: use BUG_ON
Author: Julia Lawall <julia@diku.dk> if (…) BUG(); should be replaced with BUG_ON(…) when the test has no side-effects to allow a definition of BUG_ON that drops the code completely. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ disable unlikely @ expression E,f; @@ ( if () { BUG(); } | …
Apr 28 2008
fs/ext3: use BUG_ON
Author: Julia Lawall <julia@diku.dk> if (…) BUG(); should be replaced with BUG_ON(…) when the test has no side-effects to allow a definition of BUG_ON that drops the code completely. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ disable unlikely @ expression E,f; @@ ( if () { BUG(); } | …
Apr 28 2008
fs/ext2: use BUG_ON
Author: Julia Lawall <julia@diku.dk> if (…) BUG(); should be replaced with BUG_ON(…) when the test has no side-effects to allow a definition of BUG_ON that drops the code completely. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ disable unlikely @ expression E,f; @@ ( if () { BUG(); } | …
Apr 28 2008
drivers/md: use time_before, time_before_eq, etc
Author: Julia Lawall <julia@diku.dk> The functions time_before, time_before_eq, time_after, and time_after_eq are more robust for comparing jiffies against other values. A simplified version of the semantic patch making this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ change_compare_np @ expression E; @@ ( – jiffies = E + time_after_eq(jiffies,E) | – jiffies < E + time_before(jiffies,E) …
Apr 28 2008
fbdev: use DIV_ROUND_UP or roundup
Author: Julia Lawall <julia@diku.dk> The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) – 1) / (d)) but is perhaps more readable. An extract of the semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @haskernel@ @@ #include @depends on haskernel@ expression n,d; @@ ( – (n + d – 1) / …
Apr 28 2008
serial: use time_before, time_before_eq, etc
Author: Julia Lawall <julia@diku.dk> The functions time_before, time_before_eq, time_after, and time_after_eq are more robust for comparing jiffies against other values. A simplified version of the semantic patch making this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ change_compare_np @ expression E; @@ ( – jiffies = E + time_after_eq(jiffies,E) | – jiffies < E + time_before(jiffies,E) …
Apr 28 2008
drivers/char/rtc.c: use time_before, time_before_eq, etc
Author: Julia Lawall <julia@diku.dk> The functions time_before, time_before_eq, time_after, and time_after_eq are more robust for comparing jiffies against other values. A simplified version of the semantic patch making this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ change_compare_np @ expression E; @@ ( – jiffies = E + time_after_eq(jiffies,E) | – jiffies < E + time_before(jiffies,E) …