Hi,

> can anyone explain what is the difference between the gfp flags
> GFP_KERNEL and GFP_USER, knowing the fact that both have the same
> modifier flags (__GFP_WAIT | __GFP_IO | __GFPFS)  
> 

The __GFP_HARDWALL is the flag that makes the difference. 

#define GFP_KERNEL      (__GFP_WAIT | __GFP_IO | __GFP_FS)
#define GFP_USER        (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)

There seems to be some concept of hardwalls and softwalls, and it seems this 
flag reduces the softwall check to hardwall. Given limited knowledge of 
allocator ... this is all I can say

:-(

Rajat

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