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powerpc/mm/slice: Consolidate return path in slice_get_unmapped_area()

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In a following patch, on finding a free area we will need to do
allocatinon of extra contexts as needed. Consolidating the return path
for slice_get_unmapped_area() will make that easier.

Split into a separate patch to make review easy.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2018-03-26 15:34:47 +05:30 committed by Michael Ellerman
parent 1a2f778970
commit 0dea04b288
1 changed files with 20 additions and 16 deletions
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36
arch/powerpc/mm/slice.c
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@ -574,7 +574,8 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
*/
if (slice_check_range_fits(mm, &good_mask, addr, len)) {
slice_dbg(" fits good !\n");
return addr;
newaddr = addr;
goto return_addr;
}
} else {
/* Now let's see if we can find something in the existing
@ -587,7 +588,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
* we thus return directly
*/
slice_dbg(" found area at 0x%lx\n", newaddr);
return newaddr;
goto return_addr;
}
}
/*
@ -601,6 +602,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
if (addr != 0 || fixed) {
if (slice_check_range_fits(mm, &potential_mask, addr, len)) {
slice_dbg(" fits potential !\n");
newaddr = addr;
goto convert;
}
}
@ -615,34 +617,34 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
* anywhere in the good area.
*/
if (addr) {
addr = slice_find_area(mm, len, &good_mask,
psize, topdown, high_limit);
if (addr != -ENOMEM) {
slice_dbg(" found area at 0x%lx\n", addr);
return addr;
newaddr = slice_find_area(mm, len, &good_mask,
psize, topdown, high_limit);
if (newaddr != -ENOMEM) {
slice_dbg(" found area at 0x%lx\n", newaddr);
goto return_addr;
}
}
/* Now let's see if we can find something in the existing slices
* for that size plus free slices
*/
addr = slice_find_area(mm, len, &potential_mask,
psize, topdown, high_limit);
newaddr = slice_find_area(mm, len, &potential_mask,
psize, topdown, high_limit);
#ifdef CONFIG_PPC_64K_PAGES
if (addr == -ENOMEM && psize == MMU_PAGE_64K) {
if (newaddr == -ENOMEM && psize == MMU_PAGE_64K) {
/* retry the search with 4k-page slices included */
slice_or_mask(&potential_mask, &potential_mask, compat_maskp);
addr = slice_find_area(mm, len, &potential_mask,
psize, topdown, high_limit);
newaddr = slice_find_area(mm, len, &potential_mask,
psize, topdown, high_limit);
}
#endif
if (addr == -ENOMEM)
if (newaddr == -ENOMEM)
return -ENOMEM;
slice_range_to_mask(addr, len, &potential_mask);
slice_dbg(" found potential area at 0x%lx\n", addr);
slice_range_to_mask(newaddr, len, &potential_mask);
slice_dbg(" found potential area at 0x%lx\n", newaddr);
slice_print_mask(" mask", &potential_mask);
convert:
@ -656,7 +658,9 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
if (psize > MMU_PAGE_BASE)
on_each_cpu(slice_flush_segments, mm, 1);
}
return addr;
return_addr:
return newaddr;
}
EXPORT_SYMBOL_GPL(slice_get_unmapped_area);