On Sat, Jan 11, 2025, at 01:16, Eric W. Biederman wrote: > Richard Henderson <richard.henderson@xxxxxxxxxx> writes[1]: > >> There was a Spec benchmark (I forget which) which was memory bound and ran >> twice as fast with 32-bit pointers. >> >> I copied the idea from DEC to the ELF abi, but never did all the other work >> to allow the toolchain to take advantage. >> >> Amusingly, a later Spec changed the benchmark data sets to not fit into a >> 32-bit address space, specifically because of this. >> >> I expect one could delete the ELF bit and personality and no one would >> notice. Not even the 10 remaining Alpha users. > > In [2] it was pointed out that parts of setarch weren't working > properly on alpha because it has it's own SET_PERSONALITY > implementation. In the discussion that followed Richard Henderson > pointed out that the 32bit pointer support for alpha was never > completed. > > Fix this by removing alpha's 32bit pointer support. > > As a bit of paranoia refuse to execute any alpha binaries that hafe > the EF_ALPHA_32BIT flag set. Just to fail explicitly in case someone > somewhere has binaries that trying to use alpha's 32bit pointer > support. > > [1] > https://lkml.kernel.org/r/CAFXwXrkgu=4Qn-v1PjnOR4SG0oUb9LSa0g6QXpBq4ttm52pJOQ@xxxxxxxxxxxxxx > [2] > https://lkml.kernel.org/r/20250103140148.370368-1-glaubitz@xxxxxxxxxxxxxxxxxxx > Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
