Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommu

* git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommu:
  NOMMU: Support XIP on initramfs
  NOMMU: Teach kobjsize() about VMA regions.
  FLAT: Don't attempt to expand the userspace stack to fill the space allocated
  FDPIC: Don't attempt to expand the userspace stack to fill the space allocated
  NOMMU: Improve procfs output using per-MM VMAs
  NOMMU: Make mmap allocation page trimming behaviour configurable.
  NOMMU: Make VMAs per MM as for MMU-mode linux
  NOMMU: Delete askedalloc and realalloc variables
  NOMMU: Rename ARM's struct vm_region
  NOMMU: Fix cleanup handling in ramfs_nommu_get_umapped_area()

1 files changed, 11 insertions, 23 deletions

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 7bbd5c6b372..5cebf0b3779 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -417,8 +417,8 @@ static int load_flat_file(struct linux_binprm * bprm,
 	unsigned long textpos = 0, datapos = 0, result;
 	unsigned long realdatastart = 0;
 	unsigned long text_len, data_len, bss_len, stack_len, flags;
-	unsigned long len, reallen, memp = 0;
-	unsigned long extra, rlim;
+	unsigned long len, memp = 0;
+	unsigned long memp_size, extra, rlim;
 	unsigned long *reloc = 0, *rp;
 	struct inode *inode;
 	int i, rev, relocs = 0;
@@ -543,17 +543,10 @@ static int load_flat_file(struct linux_binprm * bprm,
 		}
 
 		len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
+		len = PAGE_ALIGN(len);
 		down_write(&current->mm->mmap_sem);
 		realdatastart = do_mmap(0, 0, len,
 			PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
-		/* Remap to use all availabe slack region space */
-		if (realdatastart && (realdatastart < (unsigned long)-4096)) {
-			reallen = kobjsize((void *)realdatastart);
-			if (reallen > len) {
-				realdatastart = do_mremap(realdatastart, len,
-					reallen, MREMAP_FIXED, realdatastart);
-			}
-		}
 		up_write(&current->mm->mmap_sem);
 
 		if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) {
@@ -591,21 +584,14 @@ static int load_flat_file(struct linux_binprm * bprm,
 
 		reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len));
 		memp = realdatastart;
-
+		memp_size = len;
 	} else {
 
 		len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
+		len = PAGE_ALIGN(len);
 		down_write(&current->mm->mmap_sem);
 		textpos = do_mmap(0, 0, len,
 			PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
-		/* Remap to use all availabe slack region space */
-		if (textpos && (textpos < (unsigned long) -4096)) {
-			reallen = kobjsize((void *)textpos);
-			if (reallen > len) {
-				textpos = do_mremap(textpos, len, reallen,
-					MREMAP_FIXED, textpos);
-			}
-		}
 		up_write(&current->mm->mmap_sem);
 
 		if (!textpos  || textpos >= (unsigned long) -4096) {
@@ -622,7 +608,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 		reloc = (unsigned long *) (textpos + ntohl(hdr->reloc_start) +
 				MAX_SHARED_LIBS * sizeof(unsigned long));
 		memp = textpos;
-
+		memp_size = len;
 #ifdef CONFIG_BINFMT_ZFLAT
 		/*
 		 * load it all in and treat it like a RAM load from now on
@@ -680,10 +666,12 @@ static int load_flat_file(struct linux_binprm * bprm,
 		 * set up the brk stuff, uses any slack left in data/bss/stack
 		 * allocation.  We put the brk after the bss (between the bss
 		 * and stack) like other platforms.
+		 * Userspace code relies on the stack pointer starting out at
+		 * an address right at the end of a page.
 		 */
 		current->mm->start_brk = datapos + data_len + bss_len;
 		current->mm->brk = (current->mm->start_brk + 3) & ~3;
-		current->mm->context.end_brk = memp + kobjsize((void *) memp) - stack_len;
+		current->mm->context.end_brk = memp + memp_size - stack_len;
 	}
 
 	if (flags & FLAT_FLAG_KTRACE)
@@ -790,8 +778,8 @@ static int load_flat_file(struct linux_binprm * bprm,
 
 	/* zero the BSS,  BRK and stack areas */
 	memset((void*)(datapos + data_len), 0, bss_len + 
-			(memp + kobjsize((void *) memp) - stack_len -	/* end brk */
-			libinfo->lib_list[id].start_brk) +		/* start brk */
+			(memp + memp_size - stack_len -		/* end brk */
+			libinfo->lib_list[id].start_brk) +	/* start brk */
 			stack_len);
 
 	return 0;