Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Do not free zero sized per cpu areas
  x86: Make sure free_init_pages() frees pages on page boundary
  x86: Make smp_locks end with page alignment

diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index adedeef..b2e2460 100644 (file)
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -7,6 +7,7 @@
 
 #include <linux/init.h>
 #include <linux/start_kernel.h>
+#include <linux/mm.h>
 
 #include <asm/setup.h>
 #include <asm/sections.h>
@@ -44,9 +45,10 @@ void __init i386_start_kernel(void)
 #ifdef CONFIG_BLK_DEV_INITRD
        /* Reserve INITRD */
        if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
+               /* Assume only end is not page aligned */
                u64 ramdisk_image = boot_params.hdr.ramdisk_image;
                u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
-               u64 ramdisk_end   = ramdisk_image + ramdisk_size;
+               u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
                reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
        }
 #endif

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index b5a9896..7147143 100644 (file)
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -103,9 +103,10 @@ void __init x86_64_start_reservations(char *real_mode_data)
 #ifdef CONFIG_BLK_DEV_INITRD
        /* Reserve INITRD */
        if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
+               /* Assume only end is not page aligned */
                unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
                unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
-               unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
+               unsigned long ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
                reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
        }
 #endif

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 5d7ba1a..d76e185 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -314,16 +314,17 @@ static void __init reserve_brk(void)
 #define MAX_MAP_CHUNK  (NR_FIX_BTMAPS << PAGE_SHIFT)
 static void __init relocate_initrd(void)
 {
-
+       /* Assume only end is not page aligned */
        u64 ramdisk_image = boot_params.hdr.ramdisk_image;
        u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
+       u64 area_size     = PAGE_ALIGN(ramdisk_size);
        u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
        u64 ramdisk_here;
        unsigned long slop, clen, mapaddr;
        char *p, *q;
 
        /* We need to move the initrd down into lowmem */
-       ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
+       ramdisk_here = find_e820_area(0, end_of_lowmem, area_size,
                                         PAGE_SIZE);
 
        if (ramdisk_here == -1ULL)
@@ -332,7 +333,7 @@ static void __init relocate_initrd(void)
 
        /* Note: this includes all the lowmem currently occupied by
           the initrd, we rely on that fact to keep the data intact. */
-       reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
+       reserve_early(ramdisk_here, ramdisk_here + area_size,
                         "NEW RAMDISK");
        initrd_start = ramdisk_here + PAGE_OFFSET;
        initrd_end   = initrd_start + ramdisk_size;
@@ -376,9 +377,10 @@ static void __init relocate_initrd(void)
 
 static void __init reserve_initrd(void)
 {
+       /* Assume only end is not page aligned */
        u64 ramdisk_image = boot_params.hdr.ramdisk_image;
        u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
-       u64 ramdisk_end   = ramdisk_image + ramdisk_size;
+       u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
        u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 
        if (!boot_params.hdr.type_of_loader ||

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 44879df..2cc2497 100644 (file)
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -291,8 +291,8 @@ SECTIONS
        .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
                __smp_locks = .;
                *(.smp_locks)
-               __smp_locks_end = .;
                . = ALIGN(PAGE_SIZE);
+               __smp_locks_end = .;
        }
 
 #ifdef CONFIG_X86_64

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index e71c5cb..452ee5b 100644 (file)
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -331,11 +331,23 @@ int devmem_is_allowed(unsigned long pagenr)
 
 void free_init_pages(char *what, unsigned long begin, unsigned long end)
 {
-       unsigned long addr = begin;
+       unsigned long addr;
+       unsigned long begin_aligned, end_aligned;
 
-       if (addr >= end)
+       /* Make sure boundaries are page aligned */
+       begin_aligned = PAGE_ALIGN(begin);
+       end_aligned   = end & PAGE_MASK;
+
+       if (WARN_ON(begin_aligned != begin || end_aligned != end)) {
+               begin = begin_aligned;
+               end   = end_aligned;
+       }
+
+       if (begin >= end)
                return;
 
+       addr = begin;
+
        /*
         * If debugging page accesses then do not free this memory but
         * mark them not present - any buggy init-section access will
@@ -343,7 +355,7 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
         */
 #ifdef CONFIG_DEBUG_PAGEALLOC
        printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
-               begin, PAGE_ALIGN(end));
+               begin, end);
        set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
 #else
        /*
@@ -358,8 +370,7 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
        for (; addr < end; addr += PAGE_SIZE) {
                ClearPageReserved(virt_to_page(addr));
                init_page_count(virt_to_page(addr));
-               memset((void *)(addr & ~(PAGE_SIZE-1)),
-                       POISON_FREE_INITMEM, PAGE_SIZE);
+               memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
                free_page(addr);
                totalram_pages++;
        }
@@ -376,6 +387,15 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-       free_init_pages("initrd memory", start, end);
+       /*
+        * end could be not aligned, and We can not align that,
+        * decompresser could be confused by aligned initrd_end
+        * We already reserve the end partial page before in
+        *   - i386_start_kernel()
+        *   - x86_64_start_kernel()
+        *   - relocate_initrd()
+        * So here We can do PAGE_ALIGN() safely to get partial page to be freed
+        */
+       free_init_pages("initrd memory", start, PAGE_ALIGN(end));
 }
 #endif

diff --git a/kernel/early_res.c b/kernel/early_res.c
index 3cb2c66..31aa933 100644 (file)
--- a/kernel/early_res.c
+++ b/kernel/early_res.c
@@ -333,6 +333,12 @@ void __init free_early_partial(u64 start, u64 end)
        struct early_res *r;
        int i;
 
+       if (start == end)
+               return;
+
+       if (WARN_ONCE(start > end, "  wrong range [%#llx, %#llx]\n", start, end))
+               return;
+
 try_next:
        i = find_overlapped_early(start, end);
        if (i >= max_early_res)