Subject: + mm-audit-fix-non-modular-users-of-module_init-in-core-code.patch added to -mm tree To: paul.gortmaker@xxxxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Tue, 14 Jan 2014 15:56:48 -0800 The patch titled Subject: mm: audit/fix non-modular users of module_init in core code has been added to the -mm tree. Its filename is mm-audit-fix-non-modular-users-of-module_init-in-core-code.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-audit-fix-non-modular-users-of-module_init-in-core-code.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-audit-fix-non-modular-users-of-module_init-in-core-code.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> Subject: mm: audit/fix non-modular users of module_init in core code Code that is obj-y (always built-in) or dependent on a bool Kconfig (built-in or absent) can never be modular. So using module_init as an alias for __initcall can be somewhat misleading. Fix these up now, so that we can relocate module_init from init.h into module.h in the future. If we don't do this, we'd have to add module.h to obviously non-modular code, and that would be a worse thing. The audit targets the following module_init users for change: mm/ksm.c bool KSM mm/mmap.c bool MMU mm/huge_memory.c bool TRANSPARENT_HUGEPAGE mm/mmu_notifier.c bool MMU_NOTIFIER Note that direct use of __initcall is discouraged, vs. one of the priority categorized subgroups. As __initcall gets mapped onto device_initcall, our use of subsys_initcall (which makes sense for these files) will thus change this registration from level 6-device to level 4-subsys (i.e. slightly earlier). However no observable impact of that difference has been observed during testing. One might think that core_initcall (l2) or postcore_initcall (l3) would be more appropriate for anything in mm/ but if we look at some actual init functions themselves, we see things like: mm/huge_memory.c --> hugepage_init --> hugepage_init_sysfs mm/mmap.c --> init_user_reserve --> sysctl_user_reserve_kbytes mm/ksm.c --> ksm_init --> sysfs_create_group and hence the choice of subsys_initcall (l4) seems reasonable, and at the same time minimizes the risk of changing the priority too drastically all at once. We can adjust further in the future. Also, several instances of missing ";" at EOL are fixed. Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/huge_memory.c | 2 +- mm/ksm.c | 2 +- mm/mmap.c | 6 +++--- mm/mmu_notifier.c | 3 +-- 4 files changed, 6 insertions(+), 7 deletions(-) diff -puN mm/huge_memory.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code mm/huge_memory.c --- a/mm/huge_memory.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code +++ a/mm/huge_memory.c @@ -661,7 +661,7 @@ out: hugepage_exit_sysfs(hugepage_kobj); return err; } -module_init(hugepage_init) +subsys_initcall(hugepage_init); static int __init setup_transparent_hugepage(char *str) { diff -puN mm/ksm.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code mm/ksm.c --- a/mm/ksm.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code +++ a/mm/ksm.c @@ -2345,4 +2345,4 @@ out_free: out: return err; } -module_init(ksm_init) +subsys_initcall(ksm_init); diff -puN mm/mmap.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code mm/mmap.c --- a/mm/mmap.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code +++ a/mm/mmap.c @@ -3142,7 +3142,7 @@ static int init_user_reserve(void) sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17); return 0; } -module_init(init_user_reserve) +subsys_initcall(init_user_reserve); /* * Initialise sysctl_admin_reserve_kbytes. @@ -3163,7 +3163,7 @@ static int init_admin_reserve(void) sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13); return 0; } -module_init(init_admin_reserve) +subsys_initcall(init_admin_reserve); /* * Reinititalise user and admin reserves if memory is added or removed. @@ -3233,4 +3233,4 @@ static int __meminit init_reserve_notifi return 0; } -module_init(init_reserve_notifier) +subsys_initcall(init_reserve_notifier); diff -puN mm/mmu_notifier.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code mm/mmu_notifier.c --- a/mm/mmu_notifier.c~mm-audit-fix-non-modular-users-of-module_init-in-core-code +++ a/mm/mmu_notifier.c @@ -329,5 +329,4 @@ static int __init mmu_notifier_init(void { return init_srcu_struct(&srcu); } - -module_init(mmu_notifier_init); +subsys_initcall(mmu_notifier_init); _ Patches currently in -mm which might be from paul.gortmaker@xxxxxxxxxxxxx are lib-percpu_counterc-fix-__percpu_counter_add.patch fs-ramfs-dont-use-module_init-for-non-modular-core-code.patch mm-make-creation-of-the-mm_kobj-happen-earlier-than-device_initcall.patch printk-flush-conflicting-continuation-line.patch printk-flush-conflicting-continuation-line-fix.patch fs-proc-dont-use-module_init-for-non-modular-core-code.patch linux-next.patch kernel-audit-fix-non-modular-users-of-module_init-in-core-code.patch mm-audit-fix-non-modular-users-of-module_init-in-core-code.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html