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kaiser: stack map PAGE_SIZE at THREAD_SIZE-PAGE_SIZE

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Kaiser only needs to map one page of the stack; and
kernel/fork.c did not build on powerpc (no __PAGE_KERNEL).
It's all cleaner if linux/kaiser.h provides kaiser_map_thread_stack()
and kaiser_unmap_thread_stack() wrappers around asm/kaiser.h's
kaiser_add_mapping() and kaiser_remove_mapping().  And use
linux/kaiser.h in init/main.c to avoid the #ifdefs there.

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hugh Dickins 2017-09-03 18:57:03 -07:00 • committed by Greg Kroah-Hartman
parent ac2f1018ac
commit 0994a2cf8f
3 changed files with 38 additions and 19 deletions
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6
init/main.c
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@ -80,15 +80,13 @@
#include <linux/integrity.h>
#include <linux/proc_ns.h>
#include <linux/io.h>
#include <linux/kaiser.h>
#include <asm/io.h>
#include <asm/bugs.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
#ifdef CONFIG_KAISER
#include <asm/kaiser.h>
#endif
static int kernel_init(void *);
@ -476,9 +474,7 @@ static void __init mm_init(void)
pgtable_init();
vmalloc_init();
ioremap_huge_init();
#ifdef CONFIG_KAISER
kaiser_init();
#endif
}
asmlinkage __visible void __init start_kernel(void)