| Message ID | 20241210024119.2488608-5-kaleshsingh@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm: Introduce arch_mmap_hint() | expand |
Hi Kalesh, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] url: https://github.com/intel-lab-lkp/linux/commits/Kalesh-Singh/mm-Introduce-generic_mmap_hint/20241210-104424 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20241210024119.2488608-5-kaleshsingh%40google.com patch subject: [PATCH mm-unstable 04/17] mm: alpha: Introduce arch_mmap_hint() config: alpha-allmodconfig (https://download.01.org/0day-ci/archive/20241210/202412102123.Db7EAmhx-lkp@intel.com/config) compiler: alpha-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241210/202412102123.Db7EAmhx-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202412102123.Db7EAmhx-lkp@intel.com/ All errors (new ones prefixed by >>): arch/alpha/kernel/osf_sys.c: In function 'arch_get_unmapped_area': >> arch/alpha/kernel/osf_sys.c:1280:24: error: 'hint' undeclared (first use in this function); did you mean 'uint'? 1280 | return hint; | ^~~~ | uint arch/alpha/kernel/osf_sys.c:1280:24: note: each undeclared identifier is reported only once for each function it appears in vim +1280 arch/alpha/kernel/osf_sys.c 1248 1249 unsigned long 1250 arch_get_unmapped_area(struct file *filp, unsigned long addr, 1251 unsigned long len, unsigned long pgoff, 1252 unsigned long flags, vm_flags_t vm_flags) 1253 { 1254 unsigned long limit; 1255 1256 /* "32 bit" actually means 31 bit, since pointers sign extend. */ 1257 if (current->personality & ADDR_LIMIT_32BIT) 1258 limit = 0x80000000; 1259 else 1260 limit = TASK_SIZE; 1261 1262 if (len > limit) 1263 return -ENOMEM; 1264 1265 if (flags & MAP_FIXED) 1266 return addr; 1267 1268 /* First, see if the given suggestion fits. 1269 1270 The OSF/1 loader (/sbin/loader) relies on us returning an 1271 address larger than the requested if one exists, which is 1272 a terribly broken way to program. 1273 1274 That said, I can see the use in being able to suggest not 1275 merely specific addresses, but regions of memory -- perhaps 1276 this feature should be incorporated into all ports? */ 1277 1278 addr = arch_mmap_hint(filp, addr, len, pgoff, flags); 1279 if (addr) > 1280 return hint; 1281 1282 /* Next, try allocating at TASK_UNMAPPED_BASE. */ 1283 addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE), 1284 len, limit); 1285 if (addr != (unsigned long) -ENOMEM) 1286 return addr; 1287 1288 /* Finally, try allocating in low memory. */ 1289 addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit); 1290 1291 return addr; 1292 } 1293
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h index 635f0a5f5bbd..372885a01abd 100644 --- a/arch/alpha/include/asm/pgtable.h +++ b/arch/alpha/include/asm/pgtable.h @@ -362,5 +362,6 @@ extern void paging_init(void); /* We have our own get_unmapped_area to cope with ADDR_LIMIT_32BIT. */ #define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_MMAP_HINT #endif /* _ALPHA_PGTABLE_H */ diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c index 86185021f75a..68e61dece537 100644 --- a/arch/alpha/kernel/osf_sys.c +++ b/arch/alpha/kernel/osf_sys.c @@ -1225,6 +1225,27 @@ arch_get_unmapped_area_1(unsigned long addr, unsigned long len, return vm_unmapped_area(&info); } +unsigned long arch_mmap_hint(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + unsigned long limit; + + if (!addr) + return 0; + + /* "32 bit" actually means 31 bit, since pointers sign extend. */ + if (current->personality & ADDR_LIMIT_32BIT) + limit = 0x80000000; + else + limit = TASK_SIZE; + + if (limit - len < addr) + return 0; + + return generic_mmap_hint(filp, addr, len, pgoff, flags); +} + unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, @@ -1254,11 +1275,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, merely specific addresses, but regions of memory -- perhaps this feature should be incorporated into all ports? */ - if (addr) { - addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit); - if (addr != (unsigned long) -ENOMEM) - return addr; - } + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) + return hint; /* Next, try allocating at TASK_UNMAPPED_BASE. */ addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
Introduce alpha arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT. This is a preparatory patch, no functional change is introduced. Signed-off-by: Kalesh Singh <kaleshsingh@google.com> --- arch/alpha/include/asm/pgtable.h | 1 + arch/alpha/kernel/osf_sys.c | 29 ++++++++++++++++++++++++----- 2 files changed, 25 insertions(+), 5 deletions(-)