Re: [PATCH v2] powerpc/fadump: define MIN_RMA in bytes value to fix overflow

[Ritesh Harjani (IBM) <ritesh.list@gmail.com>]

Sayali Patil <sayalip@linux.ibm.com> writes:

> The MIN_RMA size checks in fadump_setup_param_area() use
> (MIN_RMA * 1024 * 1024), which is evaluated in int and can
> overflow when MIN_RMA is increased to values such as SZ_2G.
> This triggers compiler warnings such as:
>
> warning: integer overflow in expression of type 'int'
> results in '0' [-Woverflow]
>
> Define MIN_RMA directly in bytes using SZ_1M and update the
> callers accordingly. This avoids repeated unit conversions and
> prevents integer overflow.
>
> Also convert MIN_RMA back to MB when populating the firmware
> architecture vector, since firmware expects the value in MB.
>
> Fixes: b7bb46062457 ("powerpc/fadump: fix additional param memory reservation for HASH MMU")

Since this is not a bug per-se, so we need not add a Fixes tag.
But while we are at it, we may correct the commit subject to...

    powerpc/fadump: Define MIN_RMA in bytes rather than MB

... since there is no overflow with it's current value.

With the above changes in place, feel free to add:
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>