From 5a0e3ad6af8660be21ca98a971cd00f331318c05 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 24 Mar 2010 17:04:11 +0900 Subject: include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo Guess-its-ok-by: Christoph Lameter Cc: Ingo Molnar Cc: Lee Schermerhorn --- block/blk-barrier.c | 1 + block/blk-cgroup.c | 1 + block/blk-integrity.c | 1 + block/blk-ioc.c | 1 + block/blk-settings.c | 1 + block/blk-sysfs.c | 1 + block/blk-tag.c | 1 + block/bsg.c | 1 + block/cfq-iosched.c | 1 + block/compat_ioctl.c | 1 + block/ioctl.c | 1 + block/noop-iosched.c | 1 + 12 files changed, 12 insertions(+) (limited to 'block') diff --git a/block/blk-barrier.c b/block/blk-barrier.c index 8618d8996fea9..6d88544b677fe 100644 --- a/block/blk-barrier.c +++ b/block/blk-barrier.c @@ -5,6 +5,7 @@ #include #include #include +#include #include "blk.h" diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 4b686ad08eaaa..5fe03def34b24 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -15,6 +15,7 @@ #include #include #include +#include #include "blk-cgroup.h" static DEFINE_SPINLOCK(blkio_list_lock); diff --git a/block/blk-integrity.c b/block/blk-integrity.c index 96e83c2bdb94f..edce1ef7933d6 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "blk.h" diff --git a/block/blk-ioc.c b/block/blk-ioc.c index 3f65c8aadb2fb..d22c4c55c4068 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -7,6 +7,7 @@ #include #include #include /* for max_pfn/max_low_pfn */ +#include #include "blk.h" diff --git a/block/blk-settings.c b/block/blk-settings.c index 31e7a9375c133..d9a9db5f0a2bd 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -9,6 +9,7 @@ #include /* for max_pfn/max_low_pfn */ #include #include +#include #include "blk.h" diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 2ae2cb3f362fb..c2b821fa324a1 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -2,6 +2,7 @@ * Functions related to sysfs handling */ #include +#include #include #include #include diff --git a/block/blk-tag.c b/block/blk-tag.c index 6b0f52c20964e..ece65fc4c79b5 100644 --- a/block/blk-tag.c +++ b/block/blk-tag.c @@ -5,6 +5,7 @@ #include #include #include +#include #include "blk.h" diff --git a/block/bsg.c b/block/bsg.c index 46597a6bd112d..82d58829ba591 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index dee9d9378fee1..fc98a48554fd4 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -7,6 +7,7 @@ * Copyright (C) 2003 Jens Axboe */ #include +#include #include #include #include diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c index 4eb8e9ea4af56..f26051f446814 100644 --- a/block/compat_ioctl.c +++ b/block/compat_ioctl.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include diff --git a/block/ioctl.c b/block/ioctl.c index be48ea51faee2..8905d2a2a717c 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -1,5 +1,6 @@ #include #include +#include #include #include #include diff --git a/block/noop-iosched.c b/block/noop-iosched.c index 3a0d369d08c74..232c4b38cd376 100644 --- a/block/noop-iosched.c +++ b/block/noop-iosched.c @@ -5,6 +5,7 @@ #include #include #include +#include #include struct noop_data { -- cgit v1.2.3